Handle Pathname instances in $LOAD_PATH

I just ran `consistency_fail` on my Rails 3.2.13 app using Ruby 2.0.0-p0, which failed with the following message:

```
../.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/consistency_fail-0.3.1/lib/consistency_fail/models.rb:17
:in `=~': no implicit conversion of Pathname into String (TypeError)
```

I've checked my $LOAD_PATH and there is one instance of Pathname: ```#<Pathname:./app/views>```.

This may be just me and I could just alter my load path ```$LOAD_PATH.map!(&:to_s)```. 

If this is common, this pull request should help.